1V02

Crystal structure of the Sorghum bicolor dhurrinase 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Determinants of Substrate Specificity in Family 1 Beta-Glucosidases: Novel Insights from the Crystal Structure of Sorghum Dhurrinase-1, a Plant Beta-Glucosidase with Strict Specificity, in Complex with its Natural Substrate

Verdoucq, L.Moriniere, J.Bevan, D.R.Esen, A.Vasella, A.Henrissat, B.Czjzek, M.

(2004) J.Biol.Chem. 279: 31796

  • DOI: 10.1074/jbc.M402918200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Plant beta-glucosidases play a crucial role in defense against pests. They cleave, with variable specificity, beta-glucosides to release toxic aglycone moieties. The Sorghum bicolor beta-glucosidase isoenzyme Dhr1 has a strict specificity for its nat ...

    Plant beta-glucosidases play a crucial role in defense against pests. They cleave, with variable specificity, beta-glucosides to release toxic aglycone moieties. The Sorghum bicolor beta-glucosidase isoenzyme Dhr1 has a strict specificity for its natural substrate dhurrin (p-hydroxy-(S)-mandelonitrile-beta-D-glucoside), whereas its close homolog, the maize beta-glucosidase isoenzyme Glu1, which shares 72% sequence identity, hydrolyzes a broad spectrum of substrates in addition to its natural substrate 2-O-beta-D-glucopyranosyl-4-hydroxy-7-methoxy-1,4-benzoxaxin-3-one. Structural data from enzyme.substrate complexes of Dhr1 show that the mode of aglycone binding differs from that previously observed in the homologous maize enzyme. Specifically, the data suggest that Asn(259), Phe(261), and Ser(462), located in the aglycone-binding site of S. bicolor Dhr1, are crucial for aglycone recognition and binding. The tight binding of the aglycone moiety of dhurrin promotes the stabilization of the reaction intermediate in which the glycone moiety is in a deformed (1)S(3) conformation within the glycone-binding site, ready for nucleophilic attack to occur. Compared with the broad specificity maize beta-glucosidase, this different binding mode explains the narrow specificity of sorghum dhurrinase-1.


    Organizational Affiliation

    Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DHURRINASE
A, B, C, D, F
565Sorghum bicolorMutation(s): 0 
Find proteins for Q41290 (Sorghum bicolor)
Go to UniProtKB:  Q41290
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DHURRINASE
E
565Sorghum bicolorMutation(s): 0 
Find proteins for Q41290 (Sorghum bicolor)
Go to UniProtKB:  Q41290
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.172 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 101.050α = 90.00
b = 101.050β = 90.00
c = 279.050γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
SCALAdata scaling
REFMACrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-05-20
    Type: Initial release
  • Version 1.1: 2011-05-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance